EP2313205A1 - Appareil et procédé de revêtement - Google Patents

Appareil et procédé de revêtement

Info

Publication number
EP2313205A1
EP2313205A1 EP09798295A EP09798295A EP2313205A1 EP 2313205 A1 EP2313205 A1 EP 2313205A1 EP 09798295 A EP09798295 A EP 09798295A EP 09798295 A EP09798295 A EP 09798295A EP 2313205 A1 EP2313205 A1 EP 2313205A1
Authority
EP
European Patent Office
Prior art keywords
coating
discharge nozzle
industrial
scale
stream
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09798295A
Other languages
German (de)
English (en)
Other versions
EP2313205A4 (fr
Inventor
James D. Pape
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Armstrong World Industries Inc
Original Assignee
Armstrong World Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Armstrong World Industries Inc filed Critical Armstrong World Industries Inc
Publication of EP2313205A1 publication Critical patent/EP2313205A1/fr
Publication of EP2313205A4 publication Critical patent/EP2313205A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid

Definitions

  • the invention relates to a coating apparatus, and, more specifically, to an improved coating apparatus which provides a longitudinally extending, uniform, atomized coating stream.
  • a critical issue for manufacturers of coating equipment is the need to meet customer demands for increased efficiencies in the coating application process. Regardless of the coating type or application methodology, uniformity of application and transfer efficiency are critical parameters that continue to be addressed by research and development efforts. Selection of the appropriate application methodology depends not only on the type of coating but also on the requirements of the substrate to which it is applied. [0003] For example, where the acoustical capabilities of an object are sought to be maintained, it is widely known in the coatings art that it is critical for the coating to have little or no impact on acoustical performance of the material, i.e. the coating is acoustically transparent.
  • each nozzle 1 A-IE commonly referred to in the art as a single-point nozzle, produces an atomized fluid stream, 3A-3E respectively, which spreads out, or diverges, into a conical spray pattern.
  • the outer portions of the atomized fluid streams 3A-3A must overlap. Though undetectable to the naked eye, these overlapping streams do not uniformly apply the coating.
  • several features can be manipulated, including: the spacing of the nozzles; the spacing between the overlap header and the object to be coated; the tip geometry of the nozzles; and the flow rate of the fluid passing through the nozzles.
  • overlap header technology assumes a density gradient for each nozzle, and, thus, the effort to approach uniformity of application is an iterative process that is fundamentally variable.
  • the present invention is an industrial-scale coating apparatus for applying a liquid coating to the surface of a sound absorbing material.
  • the apparatus includes a longitudinally extending discharge nozzle having a specified length.
  • the nozzle discharges a linear stream of atomized droplets at a uniform velocity along the entire specified length of the nozzle.
  • the present invention further includes an improved methodology of spray coating a moving object on an industrial scale.
  • the method includes the steps of: (a) providing an industrial-scale coating apparatus having a longitudinally extending discharge nozzle having a specified length; (b) positioning the coating apparatus above a conveyor, the conveyor having a direction of travel such that the longitudinally extending discharge nozzle extends in a direction transverse the direction of travel of a conveyor; and (c) discharging a linear stream of atomized droplets onto the surface of an object moving on the conveyor, the linear stream of atomized droplets being discharged from the nozzle at a uniform velocity along the entire specified length of the nozzle.
  • the improved coating apparatus and spray coating methodology are particularly useful in applying a liquid coating to the surface of a material that requires a minimum deviation in acoustic capability across the entire surface of the material for optimum performance.
  • the apparatus and methodology are also useful when a minimal deviation of one or more of light reflectance, color, and gloss capability of the material is desired. Additional advantages include, but are not limited to: the elimination of visual defects created by multiple atomizing streams; the elimination of the use of a multiple atomizing streams utilizing the technique of reciprocation to randomize visual defects; and the elimination of the cost of and the maintenance of multiple, single-point atomizing spray nozzles.
  • Figure 1 is an elevation view of a prior art coating apparatus utilizing multiple single- point atomizing spray nozzles.
  • Figure 2 is a perspective view of a portion of a coating system utilizing the coating apparatus of the invention.
  • Figure 3 is a perspective view in partial cross-section of an example embodiment of the coating apparatus of the invention.
  • Figure 4 is a cross sectional view of the example embodiment illustrated in Figure 3.
  • Figure 5 is a perspective view in partial cross-section of a second example embodiment of the coating apparatus of the invention.
  • Figure 6 is a cross sectional view of the example embodiment illustrated in Figure 5.
  • the improved atomizing apparatus can be utilized in conventional industrial-scale coating systems, including systems having a longitudinally extending conveyor which transports the object or material to be coated through a coating station such as illustrated in Figure 1.
  • the atomizing apparatus 10 is positioned above a conveyor 11, or backing roller, in spaced relation, thereby forming a "coating zone".
  • the conveyor 11 has a direction of travel indicated by Arrow C.
  • the apparatus 10 is positioned in a direction transverse to the direction of travel of the conveyor 1 1.
  • an uninterrupted stream of atomized coating material 20 is discharged onto the surface of an object 22, such as an acoustical ceiling tile, at an application rate that is uniform across the entire length of the discharge nozzle 16, and, in turn, the entire length of the object 22.
  • FIGS 3 and 4 illustrate a first example embodiment of the improved industrial size coating apparatus 10 in greater detail.
  • the coating apparatus 10 includes a generally linear, longitudinally extending housing structure 12.
  • the housing structure 12 includes a hopper 14, which houses liquid coating material.
  • the liquid coating material typically used to coat materials on an industrial-sized scale, such as liquid coating material for acoustical ceiling tiles, includes about 40% to about 70% solids by weight, and preferably from about 50% to about 60% solids by weight.
  • the hopper 14 extends longitudinally and substantially the entire length of the housing structure 12. As best seen in Figure 4, at the base of the hopper 14 is a linear discharge nozzle 16 which, although not required, may also extend substantially the entire length of the housing structure 12. Typically, the liquid coating material is permitted to flow from the hopper 14 and through the linear discharge nozzle 16 by gravity.
  • the housing structure 12 further includes a first air stream 18 and a second air stream 19. Both air streams 18, 19 extend in the longitudinal direction and are positioned in parallel relation with the linear discharge nozzle 16. The outlets of the air streams 18, 19 are positioned proximate the linear discharge nozzle 16. High velocity air flows through the air streams as illustrated by arrow F, and ultimately impinges on the liquid coating material as the fluid exits the linear discharge nozzle 16. Preferably, the air stream outlets are positioned behind, e.g. above, the outlet of the discharge nozzle so that the high velocity air causes the liquid coating to rush toward the object to be coated as an uninterrupted, uniform, longitudinally extending stream of atomized fluid droplets 20 having a longitudinally extending fan radius.
  • FIGS 5 and 6 illustrate a second example embodiment of the coating apparatus of the invention.
  • the second example embodiment includes all of the features described above with respect to the first example embodiment.
  • a cap 25 which provides an area for internal mixing of the air and liquid coating prior to exiting the apparatus 10.
  • internal air mixing is defined as a fluid stream being mixed within the confines of the coating apparatus.
  • the cap 25 includes first and second side walls, 27 and 28 respectively.
  • each sidewall 27, 28 is disposed at an angle so as to form a linear opening 32 therebetween.
  • the linear cap opening 32 is preferably in alignment with the linear discharge nozzle 16. Furthermore, the length of the linear cap opening 32 is preferably substantially the same length as the longitudinally extending linear nozzle 16 and air streams 18, 19.
  • the apparatus 10, 10' may also utilize external air assistance.
  • external air assistance means that the air is added by means of an air stream outside the components of the coating apparatus such as air generated via linear air knives or jets which are known in the art. External air assistance will further atomize the stream of atomized fluid droplets and maintain uniformity. Depending on the angle on impingement, the external air assistance may increase the speed of the droplets 20 towards the spray target.

Landscapes

  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention constitue une solution de remplacement aux appareils conventionnels de revêtement par pulvérisation. Selon l'invention, avec l'appareil et la méthodologie de revêtement associée, il est possible d'assurer la production d'un courant uniforme de fluide pulvérisé, et par conséquent, l'application à échelle industrielle d'une couche de revêtement uniforme sur un objet. L'appareil et la méthodologie constituent une réponse aux nombreux problèmes posés par les paramètres critiques associés aux techniques conventionnelles d'application par jet en rideau et par jet pulvérisé, et notamment, mais sans que ce soit limitatif, pour ce qui est de la distribution uniforme, de la transparence acoustique, de la réduction ou de l'élimination des phénomènes d'obstruction des buses, et de la possibilité de ne plus avoir recours à des buses en va-et-vient.
EP09798295A 2008-07-15 2009-07-15 Appareil et procédé de revêtement Withdrawn EP2313205A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/218,432 US8789492B2 (en) 2008-07-15 2008-07-15 Coating apparatus and method
PCT/US2009/004097 WO2010008551A1 (fr) 2008-07-15 2009-07-15 Appareil et procédé de revêtement

Publications (2)

Publication Number Publication Date
EP2313205A1 true EP2313205A1 (fr) 2011-04-27
EP2313205A4 EP2313205A4 (fr) 2012-08-15

Family

ID=41530532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09798295A Withdrawn EP2313205A4 (fr) 2008-07-15 2009-07-15 Appareil et procédé de revêtement

Country Status (4)

Country Link
US (1) US8789492B2 (fr)
EP (1) EP2313205A4 (fr)
CN (1) CN102143802B (fr)
WO (1) WO2010008551A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3061613B1 (fr) * 2015-02-26 2018-03-14 Piotr Jeuté Tête d'impression par goutte à la demande et procédé d'impression
DE102016209336B4 (de) * 2016-05-30 2021-08-05 Voith Patent Gmbh Vorhangauftragswerk
CN113276389A (zh) * 2021-05-13 2021-08-20 中山市吉万包装制品有限公司 一种天花板材吸塑制造方法

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Title
See also references of WO2010008551A1 *

Also Published As

Publication number Publication date
EP2313205A4 (fr) 2012-08-15
US20100015346A1 (en) 2010-01-21
CN102143802A (zh) 2011-08-03
CN102143802B (zh) 2014-08-06
WO2010008551A1 (fr) 2010-01-21
US8789492B2 (en) 2014-07-29

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